Calcium aluminates

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Calcium aluminates phase diagram
Crystal structure of dodecacalcium hepta-aluminate, 12CaO·7Al2O3 (C12A7).[1]

Calcium aluminates are a range of materials[2] obtained by heating calcium oxide and aluminium oxide together at high temperatures. They are encountered in the manufacture of refractories and cements.

The stable phases shown in the phase diagram (formed at atmospheric pressure under an atmosphere of normal humidity) are:

In addition, other phases include:

Hydration reaction

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In contrast to Portland cements, calcium aluminates do not release calcium hydroxide (Ca(OH)2, portlandite or lime) during their hydration.

See also

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References

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  1. ^ Hosono, H.; Tanabe, K.; Takayama-Muromachi, E.; Kageyama, H.; Yamanaka, S.; Kumakura, H.; Nohara, M.; Hiramatsu, H.; Fujitsu, S. (2015). "Exploration of new superconductors and functional materials, and fabrication of superconducting tapes and wires of iron pnictides". Science and Technology of Advanced Materials. 16 (3): 033503. arXiv:1505.02240. Bibcode:2015STAdM..16c3503H. doi:10.1088/1468-6996/16/3/033503. PMC 5099821. PMID 27877784.
  2. ^ Taylor H.F.W (1990) Cement Chemistry, Academic Press, ISBN 0-12-683900-X, pp. 34–38.
  3. ^ "Mayenite Supergroup".
  4. ^ "Krotite".
  5. ^ "Grossite".
  6. ^ "Hibonite".
  7. ^ Taylor H.F.W (1990) Cement Chemistry, Academic Press, ISBN 0-12-683900-X, pp. 28, 29.
  8. ^ "Brownmillerite".

Further reading

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